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node.js
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node.js
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// @flow
import type Parser from "./index";
import UtilParser from "./util";
import { SourceLocation, type Position } from "../util/location";
import type { Comment, Node as NodeType, NodeBase } from "../types";
// Start an AST node, attaching a start offset.
class Node implements NodeBase {
constructor(parser: Parser, pos: number, loc: Position) {
this.start = pos;
this.end = 0;
this.loc = new SourceLocation(loc);
if (parser?.options.ranges) this.range = [pos, 0];
if (parser?.filename) this.loc.filename = parser.filename;
}
type: string = "";
declare start: number;
declare end: number;
declare loc: SourceLocation;
declare range: [number, number];
declare leadingComments: Array<Comment>;
declare trailingComments: Array<Comment>;
declare innerComments: Array<Comment>;
declare extra: { [key: string]: any };
__clone(): this {
// $FlowIgnore
const newNode: any = new Node();
const keys = Object.keys(this);
for (let i = 0, length = keys.length; i < length; i++) {
const key = keys[i];
// Do not clone comments that are already attached to the node
if (
key !== "leadingComments" &&
key !== "trailingComments" &&
key !== "innerComments"
) {
// $FlowIgnore
newNode[key] = this[key];
}
}
return newNode;
}
}
export class NodeUtils extends UtilParser {
startNode<T: NodeType>(): T {
// $FlowIgnore
return new Node(this, this.state.start, this.state.startLoc);
}
startNodeAt<T: NodeType>(pos: number, loc: Position): T {
// $FlowIgnore
return new Node(this, pos, loc);
}
/** Start a new node with a previous node's location. */
startNodeAtNode<T: NodeType>(type: NodeType): T {
return this.startNodeAt(type.start, type.loc.start);
}
// Finish an AST node, adding `type` and `end` properties.
finishNode<T: NodeType>(node: T, type: string): T {
return this.finishNodeAt(
node,
type,
this.state.lastTokEnd,
this.state.lastTokEndLoc,
);
}
// Finish node at given position
finishNodeAt<T: NodeType>(
node: T,
type: string,
pos: number,
loc: Position,
): T {
if (process.env.NODE_ENV !== "production" && node.end > 0) {
throw new Error(
"Do not call finishNode*() twice on the same node." +
" Instead use resetEndLocation() or change type directly.",
);
}
node.type = type;
node.end = pos;
node.loc.end = loc;
if (this.options.ranges) node.range[1] = pos;
if (this.options.attachComment) this.processComment(node);
return node;
}
resetStartLocation(node: NodeBase, start: number, startLoc: Position): void {
node.start = start;
node.loc.start = startLoc;
if (this.options.ranges) node.range[0] = start;
}
resetEndLocation(
node: NodeBase,
end?: number = this.state.lastTokEnd,
endLoc?: Position = this.state.lastTokEndLoc,
): void {
node.end = end;
node.loc.end = endLoc;
if (this.options.ranges) node.range[1] = end;
}
/**
* Reset the start location of node to the start location of locationNode
*/
resetStartLocationFromNode(node: NodeBase, locationNode: NodeBase): void {
this.resetStartLocation(node, locationNode.start, locationNode.loc.start);
}
}